<template>
  <div>
       <!-- 面包屑导航区域 -->
      <el-breadcrumb separator-class="el-icon-arrow-right">
         <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
         <el-breadcrumb-item>商品管理</el-breadcrumb-item>
         <el-breadcrumb-item>分类参数</el-breadcrumb-item>
      </el-breadcrumb>
    <!-- 卡片视图区域 -->
    <el-card>
          <el-alert show-icon title="注意:只允许为第三级分类设置相关参数!" type="warning" :closable="false"></el-alert>
          <!-- 选择商品分类区域 -->
      <el-row class="cat_opt">
          <el-col>
              <span>选择商品分类:</span>
              <!-- 选择商品分类的级联选择框 -->
              <el-cascader
                      v-model="selectedCateKeys"
                      :options="catelist"
                      expand-trigger="hover"
                      :props="cateProps"
                      @change="handleChange"
                      clearable>
              </el-cascader>
          </el-col>
      </el-row>
      <!-- tab页签区域 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
          <!-- 添加动态参数的面板 -->
          <el-tab-pane label="动态参数" name="many">
              <!-- 添加参数的按钮 -->
              <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数</el-button>
              <!-- 动态参数表格 -->
              <el-table :data="manyTableData" border stripe="">
                  <!-- 展开行 -->
                  <el-table-column type="expand">
                      <template slot-scope="scope">
                          <!-- 循环渲染tag标签 -->
                          <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i, scope.row)">
                            {{item}}
                          </el-tag>
                          <!-- 输入文本框 -->
                          <el-input
                           class="input-new-tag"
                           v-if="scope.row.inputVisible"
                           v-model="scope.row.inputValue"
                           ref="saveTagInput"
                           size="small"
                           @keyup.enter.native="handleInputConfirm(scope.row)"
                           @blur="handleInputConfirm(scope.row)">
                          </el-input>
                          <!-- 添加按钮 -->
                          <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                      </template>
                  </el-table-column>
                  <!-- 索引列 -->
                  <el-table-column type="index"></el-table-column>
                  <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                  <el-table-column label="操作">
                      <template slot-scope="scope">
                          <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                          <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
                      </template>
                  </el-table-column>
              </el-table>
          </el-tab-pane>
          <!-- 添加静态属性的面板 -->
          <el-tab-pane label="静态属性" name="only">
              <!-- 添加属性的按钮 -->
              <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加属性</el-button>
              <!-- 静态属性表格 -->
              <el-table :data="onlyTableData" border stripe="">
                  <!-- 展开行 -->
                  <el-table-column type="expand">
                      <template slot-scope="scope">
                          <!-- 循环渲染tag标签 -->
                          <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i, scope.row)">
                            {{item}}
                          </el-tag>
                          <!-- 输入文本框 -->
                          <el-input
                           class="input-new-tag"
                           v-if="scope.row.inputVisible"
                           v-model="scope.row.inputValue"
                           ref="saveTagInput"
                           size="small"
                           @keyup.enter.native="handleInputConfirm(scope.row)"
                           @blur="handleInputConfirm(scope.row)">
                          </el-input>
                          <!-- 添加按钮 -->
                          <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                      </template>
                  </el-table-column>
                  <!-- 索引列 -->
                  <el-table-column type="index"></el-table-column>
                  <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                  <el-table-column label="操作">
                      <template slot-scope="scope">
                          <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                          <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
                      </template>
                  </el-table-column>
              </el-table>
          </el-tab-pane>
      </el-tabs>
    </el-card>
    <!-- 添加参数的对话框 -->
    <el-dialog
     :title="'添加'+titleText"
     :visible.sync="addDialogVisible"
     width="50%"
     @close="addDialogClosed">
        <!-- 添加参数的对话框 -->
        <el-form 
        :model="addForm" 
        :rules="addFormRules" 
        ref="addFormRef" 
        label-width="100px">
            <el-form-item :label="titleText" prop="attr_name">
                <el-input v-model="addForm.attr_name"></el-input>
            </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
            <el-button @click="addDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="addParams">确 定</el-button>
        </span>
    </el-dialog>
    <!-- 修改参数的对话框 -->
    <el-dialog
     :title="'修改'+titleText"
     :visible.sync="editDialogVisible"
     width="50%"
     @close="editDialogClosed">
        <!-- 修改参数的对话框 -->
        <el-form 
        :model="editForm" 
        :rules="editFormRules" 
        ref="editFormRef" 
        label-width="100px">
            <el-form-item :label="titleText" prop="attr_name">
                <el-input v-model="editForm.attr_name"></el-input>
            </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
            <el-button @click="editDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="editParams">确 定</el-button>
        </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
    data() {
        return {
            // 商品分类列表
            catelist: [],
            // 级联选择框的配置对象
            cateProps: {
                value: 'cat_id',
                label: 'cat_name',
                children: 'children'
            },
            // 级联选择框双向绑定到的数组
            selectedCateKeys: [],
            // 被激活的页签名称
            activeName: 'many',
            // 动态参数的数据
             manyTableData: [],
             // 静态参数的数据
             onlyTableData: [],
            //  控制添加对话框的显示与隐藏
             addDialogVisible: false,
            //  添加参数的表单数据对象
             addForm: {
                 attr_name: ''
             },
            //  添加表单的验证规则对象
             addFormRules: {
                attr_name: [
                    { required: true, message: '请输入参数名称',trigger: 'blur'}
                ]
             },
             //  控制修改对话框的显示与隐藏
             editDialogVisible: false,
            //  修改参数的表单数据对象
             editForm: {},
             //  修改表单的验证规则对象
             editFormRules: {
                attr_name: [
                    { required: true, message: '请输入参数名称',trigger: 'blur'}
                ]
             }
        }
    },
    created() {
        this.getCateList()
    },
    methods: {
        // 获取所有的商品分类列表
        async getCateList() {
            const { data: res } = await this.$http.get('categories')
            if (res.meta.status !== 200) {
                return this.$message.error('获取商品分类失败!')
            }
            // 把数据列表赋值给catelist
            this.catelist = res.data
        },
        // 级联选择框选中项变化会触发这个函数
        handleChange() {
            this.getParamsData()
        },
        // Tab页签点击事件的处理函数
        handleTabClick() {
            console.log(this.activeName);
            this.getParamsData()
        },
        // 获取参数的列表数据
        async getParamsData() {
            // 证明选中的不是三级分类
            if (this.selectedCateKeys.length !== 3) {
                this.selectedCateKeys = []
                this.manyTableData = []
                this.onlyTableData = []
                return
            }
            // 证明选中的是三级分类
            console.log(this.selectedCateKeys);
            // 根据所选分类的Id,和当前所处的面板,获取对应的参数
            const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`,{
                params: { sel: this.activeName }
            })
            if (res.meta.status !== 200) {
                return this.$message.error('获取参数列表失败!')
            }
            res.data.forEach(item => {
                item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
                // 控制文本框的显示与隐藏
                item.inputVisible = false
                // 文本框输入的值
                item.inputValue = ''
            })
            console.log(res.data)
            if (this.activeName === 'many') {
                this.manyTableData = res.data
            } else {
                 this.onlyTableData = res.data
            }
        },
        // 监听对话框的关闭事件
        addDialogClosed() {
            this.$refs.addFormRef.resetFields()
        },
        // 点击按钮,添加参数
        addParams() {
            this.$refs.addFormRef.validate(async valid => {
                if (!valid) return
                const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`, {
                    attr_name: this.addForm.attr_name,
                    attr_sel: this.activeName
                })
                if (res.meta.status !== 201) {
                    return this.$message.error('添加参数失败!')
                }
                this.$message.success('添加参数成功!')
                this.getParamsData()
                this.addDialogVisible = false
            })
        },
        // 点击按钮,展示修改的对话框
        async showEditDialog(attr_id) {
            // 查询当前参数的信息
            const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`, {
                params: { attr_sel: this.activeName}
            })
            if (res.meta.status !== 200) {
                return this.$message.error('获取参数信息失败!')
            }
            this.editForm = res.data

            this.editDialogVisible = true
        },
        // 重置修改的表单
        editDialogClosed() {
            this.$refs.editFormRef.resetFields()
        },
        // 点击按钮,修改参数信息
        editParams() {
            this.$refs.editFormRef.validate(async valid => {
                if (!valid) return
                const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, {
                    attr_name: this.editForm.attr_name,
                    attr_sel: this.activeName
                })
                if (res.meta.status !== 200) {
                    return this.$message.error('修改参数失败!')
                }
                this.$message.success('修改参数成功!')
                this.getParamsData()
                this.editDialogVisible = false
            })
        },
        // 根据Id删除对应的参数项
        async removeParams(attr_id) {
            const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
            }).catch(err => err)
            // 如果用户确认删除，则返回值为字符串 confirm
            // 如果用户取消删除，则返回值为字符串 cancel
            // console.log(confirmResult);
            if (confirmResult !== 'confirm') {
                return this.$message.info('已取消删除')
            }
            // console.log('确认了删除');
            const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
            if (res.meta.status !== 200) {
                return this.$message.error('删除参数失败!')
            }
            this.$message.success('删除参数成功!')
            this.getParamsData()
        },
        // 文本框失去了焦点或按下了enter都会触发
        async handleInputConfirm(row) {
            if(row.inputValue.trim().length === 0) {
                row.inputValue = ''
                row.inputVisible = false
                return
            }
            // 如果没有return，证明输入的内容需要做后续处理
            row.attr_vals.push(row.inputValue.trim())
            row.inputValue = ''
            row.inputVisible = false
            // 需要发起请求，保存这次操作
            this.saveAttrVals(row)
        },
        // 将对 attr_vals 的操作保存到数据库
        async saveAttrVals(row) {
            // 需要发起请求，保存这次操作
            const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
                attr_name: row.attr_name,
                attr_sel: row.attr_sel,
                attr_vals: row.attr_vals.join(' ')
            })
            if(res.meta.status !== 200) {
                return this.$message.error('修改参数项失败!')
            }
            this.$message.success('修改参数项成功!')
        },
        // 点击按钮，展示文本输入框
        showInput(row) {
            row.inputVisible = true
            this.$nextTick(_ => {
            this.$refs.saveTagInput.$refs.input.focus()
            })
        },
        // 删除对应的参数可选项
        handleClose(i, row) {
            row.attr_vals.splice(i, 1)
            this.saveAttrVals(row)
        }   
    },
    computed: {
        // 如果按钮需要被禁用,返回true,否则返回false
        isBtnDisabled() {
            if (this.selectedCateKeys.length !== 3) {
                return true
            }
            return false
        },
        // 当前选中的三级分类的Id
        cateId() {
            if (this.selectedCateKeys.length ===3) {
                return this.selectedCateKeys[2]
            }
            return null
        },
        // 动态计算标题的文本
        titleText() {
            if (this.activeName === 'many') {
                return '动态参数'
            }
            return '静态属性'
        }
    }
}
</script>

<style scoped>
.cat_opt {
    margin: 15px 0;
}
.el-tag {
    margin: 10px;
}
.input-new-tag {
    width: 120px;
}
</style>